PHARMACEUTICAL NOTICES. 
185 
transmitted to the vessel containing the carbonate of soda by- 
means of a tube fixed to the opening near the diaphragm: the 
second tube destined to bring the hydrochloric acid upon the 
marble, should be bent S form, and widened at its superior 
part: place it vertically in the customary manner. Plunge 
into the S tube a syphon, starting from the acid reservoir, and 
let its longest branch (that which is plunged into the S tube) 
be terminated by a capillary opening, so that when the syphon 
is exhausted of air, the acid will pass drop by drop. 
When the apparatus begins to work properly, it may be left 
to itself for a length of time proportioned to the capacity of 
the vessel serving as the reservoir. The solution of chloride of 
calcium is to be removed every day, by means of the tube 
attached to the inferior part of the vessel containing the 
broken marble: operate in the same manner for the liquid 
which runs from the crystals, according to their degree of 
saturation. Be careful to renew the acid and marble when 
necessary. 
The carbonate of soda of the first vessel is perceived to be 
saturated, when the water begins to run from beneath the 
crystals contained in the second vessel. At this point sus- 
pend the operation by removing the syphon which conducts 
the acid. The luting being now taken away, and the lid re- 
moved, the Bi-Carbonate of Soda is exhibited in the form of 
skeletons of the original crystals of soda, loosely arranged and 
possessing a snow white crystalline appearance. 
Nothing farther remains but to place it upon frames, cover- 
ed with paper, and to dry in a stove. 
Reference to the Jipj>aratus. 
A, diluted acid, 
B, marble. 
C, water to wash the gas. 
D, carbonate of soda. 
1, syphon. 
2, tube for removing muriate of lime. 
3, tube connecting with second box. 
4, tube to draw off the water. 
VOL. VI. —NO. III. 
24 
